I've tried to get IP over USB working on a Raspberry Pi 4 with 2G of memory. usbnet works fine with Raspbian on this same hardware setup

usrcfg.txt (absence of dr_mode=peripheral doesn't seem to make a difference)

dtoverlay=dwc2,dr_mode=peripheral

nobtcmd.txt:

net.ifnames=0 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=LABEL=writable rootfstype=ext4 elevator=deadline rootwait modules-load=dwc2,g_ether fixrtc
root@ubuntu:/boot/firmware# ip a show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group defa
ult qlen 1000 link/ether dc:a6:32:02:a2:77 brd ff:ff:ff:ff:ff:ff inet 192.168.1.132/24 brd 192.168.1.255 scope global dynamic eth0 valid_lft 85802sec preferred_lft 85802sec inet6 fe80::dea6:32ff:fe02:a277/64 scope link valid_lft forever preferred_lft forever
root@ubuntu:/boot/firmware# ip a show usb0
Device "usb0" does not exist.
root@ubuntu:/boot/firmware# lsmod | grep g_ether
g_ether 16384 0
usb_f_rndis 45056 1 g_ether
u_ether 32768 2 usb_f_rndis,g_ether
libcomposite 77824 2 usb_f_rndis,g_ether
root@ubuntu:/boot/firmware# 

I think this is a clue to the problem:

[ 9.117963] udc-core: couldn't find an available UDC - added [g_ether] to list

1

1 Answer

The problem is that the kernel config did not include it. The kernel needs to be rebuilt after setting CONFIG_USB_DWC2_DUAL_ROLE and CONFIG_USB_OTG.

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